TRIPLE PECL-TO-ECL TRANSLATOR FEATURES DESCRIPTION ■ 620ps typical propagation delay The SY100EL91 is a triple PECL-to-ECL translator. It receives standard voltage PECL signals and translates them to different ECL output signals. A VBB output is provided for interfacing with single ended PECL signals at the input. If a single ended input is to be used, the VBB output should be connected to the D input. The active signal would then drive the D input. When used, the VBB output should be bypassed to ground via a 0.01µF capacitor. The VBB output is designed to act as the switching reference for the EL91 under single ended input switching conditions. As a result this pin can only source/sink up to 0.5mA of current. To accomplish the level translation the EL91 requires three power rails. The VCC supply should be connected to the positive supply, and the V EE pin should be connected to the negative power supply. The GND pins as expected are connected to the system ground plane. Both VEE and VCC should be bypassed to ground via 0.01µF capacitors. Under open input conditions, the D input will be biased at VCC/2 and the D input will be pulled to GND. This condition will force the Q output to a LOW, ensuring stability. ■ Fully differential design ■ Supports standard operation ■ Available in 20-pin SOIC package PIN CONFIGURATION/BLOCK DIAGRAM ECL PECL VCC 1 20 VCC Q0 D0 3 18 Q0 17 GND D1 5 16 Q1 D1 6 15 Q1 7 14 GND 13 Q2 12 Q2 11 VCC D2 9 ECL D2 8 PECL PECL_V BB ECL 19 PECL D0 2 PECL_V BB 4 SY100EL91 FINAL PIN NAMES Pin VEE 10 SOIC TOP VIEW Function Dn PECL Inputs Qn ECL Outputs PECL_VBB PECL Reference Voltage Output Rev.: C 1 Amendment: /0 Issue Date: February 2003 SY100EL91 Micrel PECL INPUT DC ELECTRICAL CHARACTERISTICS TA = –40°C Symbol TA = 0°C TA = +25°C Parameter Min. Typ. Max. Min. Typ. Max. Min. Min. Typ. Max. Unit VCC Power Supply Voltage 4.75 — 5.25 4.75 — 5.25 4.75 — 5.25 4.75 — 5.25 V VIH Input HIGH Voltage(1) 3.835 — 4.120 3.835 — 4.120 3.835 — 4.120 3.835 — 4.120 V VIL Input LOW Voltage(1) 3.190 — 3.525 3.190 — 3.525 3.190 — 3.525 3.190 — 3.525 V IIH Input HIGH Current — — 150 — — 150 — — 150 — — 150 µA IIL Input LOW Current Dn Dn 0.5 –600 — — — — 0.5 –600 — — — — 0.5 –600 — — — — 0.5 –600 — — — — µA VBB Output Reference(1) 3.620 — 3.740 3.620 — 3.740 3.620 — 3.740 3.620 — 3.740 V ICC Power Supply Current — — — 11 — 6.0 11 — — 11 mA 11 — Typ. Max. TA = +85°C NOTE: 1. These values are for VCC = 5V. Level specifications will vary 1:1 with VCC. ECL OUTPUT DC ELECTRICAL CHARACTERISTICS TA = –40°C Symbol TA = 0°C TA = +25°C TA = +85°C Parameter Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit VEE Power Supply Voltage –4.2 — –5.5 –4.2 — –5.5 –4.2 — –5.5 –4.2 — –5.5 V VOH Output HIGH Voltage –1085 — –880 –1025 — –880 –1025 –955 –880 –1025 — –880 mV VOL Output LOW Voltage –1830 — –1555 –1810 — –1620 –1810 –1705 –1620 –1810 — –1620 mV IEE Power Supply Current — — — 30 mA 28 — — 2 28 — 22 28 — SY100EL91 Micrel AC ELECTRICAL CHARACTERISTICS PECL: VCC = +4.75V to +5.25V, ECL: VEE = -4.2V to -5.5V TA = –40°C Symbol Parameter tPLH tPHL Propagation Delay D to Q tskew Within-Device Skew(1) Output-to-Output Part-to-Part (Diff.) Duty Cycle (Diff.) Diff. S.E. TA = 0°C TA = +25°C TA = +85°C Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit 520 470 620 620 720 770 520 470 620 620 720 770 520 470 620 620 720 770 550 500 650 650 750 800 ps — — — — — 25 100 200 — — — — — — 25 100 200 — — — — 20 — 25 100 200 — — — — — — 25 100 200 — ps mV VPP Minimum Input Swing(2) 200 — — 200 — — 200 — — 200 — — VCMR Common Mode Range(3) VPP < 500mV VPP > 500mV 1.3 1.5 — — VCC–0.2 — — VCC–0.2 — — VCC–0.2 1.2 1.4 — — VCC–0.2 VCC–0.2 1.2 1.4 VCC–0.2 VCC–0.2 1.2 1.4 320 400 580 320 400 580 320 400 580 320 400 580 tr tf Output Rise/Fall Times Q (20% to 80%) V VCC–0.2 ps NOTES: 1. Skew is measured between outputs under identical transitions. 2. Minimum input swing for which AC parameters are guaranteed. The device has a DC gain of ~40. 3. The CMR range is referenced to the most positive side of the differential input signal. Normal operation is obtained if the HIGH level falls within the specified range and the peak-to-peak voltage lies between VPP min. and 1V. PRODUCT ORDERING CODE Ordering Code SY100EL91ZC SY100EL91ZCTR* Package Type Operating Range Marking Code Z20-1 Commercial XEL91 XEL91 Z20-1 Commercial Ordering Code Operating Range Marking Code SY100EL91ZI(1) Z20-1 Industrial XEL91 SY100EL91ZITR*(1) Z20-1 Industrial XEL91 *Tape and Reel *Tape and Reel Note 1. Package Type Recommended for new designs. 3 SY100EL91 Micrel 20 LEAD SOIC .300" WIDE (Z20-1) Rev. 03 MICREL, INC. TEL 1849 FORTUNE DRIVE SAN JOSE, CA 95131 + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB USA http://www.micrel.com The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2003 Micrel, Incorporated. 4